1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * TI j721e Cadence MHDP8546 DP wrapper
4  *
5  * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
6  * Author: Jyri Sarha <jsarha@ti.com>
7  */
8 
9 #include <linux/io.h>
10 #include <linux/platform_device.h>
11 
12 #include "cdns-mhdp8546-j721e.h"
13 
14 #define	REVISION			0x00
15 #define	DPTX_IPCFG			0x04
16 #define	ECC_MEM_CFG			0x08
17 #define	DPTX_DSC_CFG			0x0c
18 #define	DPTX_SRC_CFG			0x10
19 #define	DPTX_VIF_SECURE_MODE_CFG	0x14
20 #define	DPTX_VIF_CONN_STATUS		0x18
21 #define	PHY_CLK_STATUS			0x1c
22 
23 #define DPTX_SRC_AIF_EN			BIT(16)
24 #define DPTX_SRC_VIF_3_IN30B		BIT(11)
25 #define DPTX_SRC_VIF_2_IN30B		BIT(10)
26 #define DPTX_SRC_VIF_1_IN30B		BIT(9)
27 #define DPTX_SRC_VIF_0_IN30B		BIT(8)
28 #define DPTX_SRC_VIF_3_SEL_DPI5		BIT(7)
29 #define DPTX_SRC_VIF_3_SEL_DPI3		0
30 #define DPTX_SRC_VIF_2_SEL_DPI4		BIT(6)
31 #define DPTX_SRC_VIF_2_SEL_DPI2		0
32 #define DPTX_SRC_VIF_1_SEL_DPI3		BIT(5)
33 #define DPTX_SRC_VIF_1_SEL_DPI1		0
34 #define DPTX_SRC_VIF_0_SEL_DPI2		BIT(4)
35 #define DPTX_SRC_VIF_0_SEL_DPI0		0
36 #define DPTX_SRC_VIF_3_EN		BIT(3)
37 #define DPTX_SRC_VIF_2_EN		BIT(2)
38 #define DPTX_SRC_VIF_1_EN		BIT(1)
39 #define DPTX_SRC_VIF_0_EN		BIT(0)
40 
41 /* TODO turn DPTX_IPCFG fw_mem_clk_en at pm_runtime_suspend. */
42 
cdns_mhdp_j721e_init(struct cdns_mhdp_device * mhdp)43 static int cdns_mhdp_j721e_init(struct cdns_mhdp_device *mhdp)
44 {
45 	struct platform_device *pdev = to_platform_device(mhdp->dev);
46 
47 	mhdp->j721e_regs = devm_platform_ioremap_resource(pdev, 1);
48 	return PTR_ERR_OR_ZERO(mhdp->j721e_regs);
49 }
50 
cdns_mhdp_j721e_enable(struct cdns_mhdp_device * mhdp)51 static void cdns_mhdp_j721e_enable(struct cdns_mhdp_device *mhdp)
52 {
53 	/*
54 	 * Enable VIF_0 and select DPI2 as its input. DSS0 DPI0 is connected
55 	 * to eDP DPI2. This is the only supported SST configuration on
56 	 * J721E.
57 	 */
58 	writel(DPTX_SRC_VIF_0_EN | DPTX_SRC_VIF_0_SEL_DPI2,
59 	       mhdp->j721e_regs + DPTX_SRC_CFG);
60 }
61 
cdns_mhdp_j721e_disable(struct cdns_mhdp_device * mhdp)62 static void cdns_mhdp_j721e_disable(struct cdns_mhdp_device *mhdp)
63 {
64 	/* Put everything to defaults  */
65 	writel(0, mhdp->j721e_regs + DPTX_DSC_CFG);
66 }
67 
68 const struct mhdp_platform_ops mhdp_ti_j721e_ops = {
69 	.init = cdns_mhdp_j721e_init,
70 	.enable = cdns_mhdp_j721e_enable,
71 	.disable = cdns_mhdp_j721e_disable,
72 };
73 
74 const struct drm_bridge_timings mhdp_ti_j721e_bridge_timings = {
75 	.input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE |
76 			   DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE |
77 			   DRM_BUS_FLAG_DE_HIGH,
78 };
79